Php – Trying to get .htaccess to redirect to https but conflicting with existing redirects

I’v just activated an SSL Certificate on a site and went to add the usual .htaccess redirect info.

However, there’s an existing .htaccess file with a whole set of redirects already in place (I’ll attach at the bottom).

When I try to add the https re-direct it keeps trying to redirect and eventually gives up…
Is there a way to keep add the https redirect in?

Here’s the existing .htaccess file contents:

#php_value auto_prepend_file    /kunden/homepages/8/d130052251/htdocs/kralinator/hosted/bellemellor/admin/psycho.php
<IfModule mod_rewrite.c>
Options +FollowSymLinks
Options -Indexes
RewriteEngine On
RewriteBase /

#Rewrites...
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d 
RewriteRule .* - [L]

RewriteCond %{QUERY_STRING} ^[^=]*$
RewriteCond %{QUERY_STRING} %2d|- [NC]
RewriteRule .? - [F,L]

#JS/CSS combinator
RewriteRule ^admin/css/(.*.css) admin/combine.php?type=css&files=$1
RewriteRule ^admin/js/(.*.js) admin/combine.php?type=javascript&files=$1
#RewriteRule ^css/(.*.css) combine.php?type=css&files=$1
#RewriteRule ^js/(.*.js) combine.php?type=javascript&files=$1

#Pages
RewriteRule ^([A-Za-z0-9-]+)/?$ index.php?level1=$1 [N,QSA]
RewriteRule ^([A-Za-z0-9-]+)/([A-Za-z0-9-]+)/?$ index.php?level1=$1&level2=$2 [N,QSA]
RewriteRule ^([A-Za-z0-9-]+)/([A-Za-z0-9-]+)/([A-Za-z0-9-]+)/?$ index.php?    level1=$1&level2=$2&level3=$3 [N,QSA]
RewriteRule ^([A-Za-z0-9-]+)/([A-Za-z0-9-]+)/([A-Za-z0-9-]+)/([A-Za-z0-9-]+)/?$ index.php?level1=$1&level2=$2&level3=$3&level4=$4 [N,QSA]
RewriteRule ^([A-Za-z0-9-]+)/([A-Za-z0-9-]+)/([A-Za-z0-9-]+)/([A-Za-z0-9-]+)/([A-Za-z0-9-]+)/?$ index.php?level1=$1&level2=$2&level3=$3&level4=$4&level5=$5 [L,QSA]

I added the https redirect in different locations in the file but to no avail.
I’m a front-end developer and haven’t encountered this before as I normally only have the basic https redirect in a .htaccess file as follows:

RewriteEngine On 
RewriteCond %{SERVER_PORT} 80 
RewriteRule ^(.*)$ https://www.example.co.uk/index.php$1 [R,L]

Thanks in advance.